Siobla metallica Takeuchi, 1929

Shinohara, Akihiko, Wei, Meicai & Niu, Gengyun, 2013, Revision of Siobla (Hymenoptera, Tenthredinidae) from Japan, Zootaxa 3746 (1), pp. 1-40 : 18

Siobla metallica Takeuchi, 1929

( Figs 2 e–f, 4g –i, 5m –n, 6f, 7f, 8f, o)

Siobla metallica Takeuchi, 1929: 495 ; Malaise, 1934: 23; Takeuchi, 1937: 58; Takeuchi, 1952: 18; Takeuchi, 1955: 120, plate 54, 809; Togashi, 1965: 246, plate 123, 28; Togashi, 1970b: 18, 63; Okutani, 1972: 18; Okutani, 1973: 19; Okutani, 1974b: 195; Togashi, 1978: 81: Naito, 1982: 574; Nambu, 1992: 11; Nambu, 1998: 22; Togashi, 1998b: 35; Togashi & Yamamoto, 2000: 716; Katayama, 2004: 95; Naito et al., 2004: 57, fig. 106; Yoshida, 2006: 91; Togashi, 2008: 490, plate 142, 2536; Taeger et al., 2010: 584; Niu & Wei, 2010: 50; Niu et al., 2012: 14.

Distribution. Japan (Honshu, Shikoku).

Primary type examined. Holotype of Siobla metallica ( Fig. 4 g–i): ♀, “ 16. VII. 1929, Mt. Jonen, Takeuchi” “ Siobla metallica Takeuchi , Holotype ” (OPU).

Other material examined (see Appendix). 159 specimens (42 ♀ and 117 ♂).

Variation. The length varies from 12.0 to 15.0 mm in the female and 10.0 to 13.5 mm in the male. The colouration varies little. In both sexes, the whitish marking on each lateral ventral margin of the tergum 2 usually occupies only the anterior part reaching to the spiracle, while it rarely extends to the posterior margin of the tergum.

Remarks. This is the only species of the S. metallica group (Niu & Wei 2010; Niu et al. 2012) known in Japan and it is easily recognized by its metallic bluish colouration among the Japanese Siobla species. For separation of this species from the other members of the species group, see Niu et al. (2012).

In their figure 23, Niu et al. (2012) gave a mark in the coastal region of Okayama or Hiroshima prefecture in southwestern Honshu to show a distribution record of S. metallica . This is an incorrect record based on a simple technical error. This species is unlikely to occur in that area and there is no previous collection record.

Figures

FIGURE 2. Siobla species, dorsal view. a. S. japonica, paratype, ♀, Hikagedaira; b. S. japonica, paratype, ♂, Marunuma; c. S. jucunda, ♀, Asahidake-onsen; d. S. jucunda, ♂, Asahidake-onsen; e. S. metallica, ♀, Shiga-kogen; f. S. metallica, ♂, Kiyosato; g. S. pulchra, holotype, ♀; h. S. pulchra, paratype, ♂, Nakayama-toge. Scale bar = 1 mm.

FIGURE 4. a – c. Holotype of S. ferox var. hirasana. a. Labels; b. Dorsal view; c. Lateral view. d – f. Lectotype of S. jucunda. d. Labels; e. Dorsal view; f. Lateral view. g – i. Holotype of S. metallica. g. Labels; h. Dorsal view; i. Lateral view. j – l. S. sturmii (Lectotype of Macrophya pacifica). h. Labels; i. Dorsal view; j. Lateral view.